Lucy, the narrating voice, Lockwood and George are still working as an agency to catch the spirits haunting London, and they sill want to be involved in some major case, in order also to promote better their agency.

The numerous – small – works force them to work separately, and from this derives the decision to hire an assistant to help them in sorting out their activities: Holly Murno, who is however not liked by Lucy, also due to their character differences.

Lucy is more than ever the main character of the novel, and, her being the narrating voice, we see her bein uncertain, torn between wanting to test her listening skill and restraining to avoid unnecessary risks. She always doubts her role in the agency, also because she is jealous of Holly, who seems to her as perfect and insufferable.

In the series The Hollow boy is the most well-built novel, or the one I liked more, thanks also the availability of two novels before to set out world and characters build; here we face more delicate aspects of the characters (Lockwood and her sister death, Lucy and her uncertainties). The novel ends with a shocking event, and so I’m already waiting for the fourth book to come out.